Ballscrews or rack and pinion? What module of rack and pinion is the best?

[JAZZCNC]

Whic one is beeter to go , the RM2505 or RM2510?

Ok well if this for Wood router then you absolutley don't want Rm2505 as it will be far too slow.

Now because of the length of travel then I suggest you go with Rm2525 and use a ratio 2:1 on the screws. This will help you with length as the ratio means the screw is turning half the speed of Rm2510 but giving similair feedrate so less likely to whip and Vibrate. The ratio will increase torque and resolution but lower the RPM but because you have larger 25mm pitch then it will give roughly the same feeds has RM2510.